Let arlec fan speed go down to 0.

From change suggested by @darek-margas on PR #55.

custom_components/tuya_local/devices/arlec_fan.yaml

@@ -9,7 +9,7 @@ primary_entity:
       name: speed
       type: integer
       range:
-        min: 1
+        min: 0
         max: 6
       mapping:
         - scale: 0.06